Third to each



UNITED STATES PATENT OFFICE.

CHARLES OOON, OF SAUGERTIES, ASSIGNOR TO LEWIS B. ADAMS, OF SAME PLACE, AND MORGAN A. DAYTON, JR, OF MILTON, NEW YORK, ONE- THIRD TO EACH.

PROCESS OF REPULPlNG PAPER.

SPECIFICATION formingpart of Letters Patent No. 225,347, dated March 9, 1880. Application filed December 17, 1879.

To all whom it may concern:

.Beit known that 1, CHARLES GooN, of Sangerties, in the county of Ulster and State of New York, have invented a new and useful Improvement in Processes of Repulping Paper; and I do hereby declare that the follow ing is a full, clear, and exact description of the same.

Heretofore in utilizing paper shavings, trim- Io mings, and waste paper, it has been customary to mix them with the rag stock and regrind them together, for the reason that such paper, if ground by itself, has its fiber so torn and shortened as to fail to unite in a web of :5 sufficient tenacity. The utilization of this paper is then attended with all the delay of working up the original rag stock.

The object of my invention is to secure the utilization of this stock to form a quality of paper as good as that from which such stock .was out and without occupying more than a few hours for its manufacture.

To this end my invention consists in causing the beater-engine to operate upon such stock, while suspended in a bath of hot water or othei liggjd, without regrinding.

In carrying out my invention I take the stock and first boil it in a separate vessel, in

the usual manner. Instead,then, of grinding 0 this stock, I place the same in the beater and cause the heater to act upon such material while suspended in hot water or other liquid.

Heretofore the stock has received onlythe one heating, which was preliminary to the grinding, and after which cold Water was used. 3 5 The use of cold water in the heater I find causes the fiber of the paper to set again by cooling the size, so that'the grinding between the first boiling and the final pulping is abso lutely necessary. 4.0

By my process I use hot water in the beater, and its action is such that the grinding is rendered'unnecessary, and yet the fiber is disin tegrated without being torn or shortened, so that pulp which results therefrom is as good for paper-making as it was beforeit was made into the paper from which the stock came. While this result is secured also, I am enabled to reduce the stock into a pulp and make it into paper within a few hours, instead of carrying it through the ordinary process of pulping, which requires a number of days.

Having thus described my invention, what I claim is- The process of repulpin g paper which consists in causing the beater-engine to operate upon the same while suspended in a hot bath, substantially as described.

O. L. VAN DEUsEN, E. BARRITT. 

